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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_WM_RESIZE_SHADOW_CONTROLLER_H_
      6 #define ASH_WM_RESIZE_SHADOW_CONTROLLER_H_
      7 
      8 #include <map>
      9 
     10 #include "ash/ash_export.h"
     11 #include "base/basictypes.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/memory/linked_ptr.h"
     14 #include "ui/aura/window_observer.h"
     15 
     16 namespace aura {
     17 class Window;
     18 }
     19 
     20 namespace ash {
     21 namespace internal {
     22 
     23 class ResizeShadow;
     24 
     25 // ResizeShadowController observes changes to resizable windows and shows
     26 // a resize handle visual effect when the cursor is near the edges.
     27 class ASH_EXPORT ResizeShadowController : public aura::WindowObserver {
     28  public:
     29   ResizeShadowController();
     30   virtual ~ResizeShadowController();
     31 
     32   // Shows the appropriate shadow for a given |window| and |hit_test| location.
     33   void ShowShadow(aura::Window* window, int hit_test);
     34 
     35   // Hides the shadow for a |window|, if it has one.
     36   void HideShadow(aura::Window* window);
     37 
     38   ResizeShadow* GetShadowForWindowForTest(aura::Window* window);
     39 
     40   // aura::WindowObserver overrides:
     41   virtual void OnWindowBoundsChanged(
     42       aura::Window* window,
     43       const gfx::Rect& old_bounds,
     44       const gfx::Rect& new_bounds) OVERRIDE;
     45   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
     46 
     47  private:
     48   typedef std::map<aura::Window*, linked_ptr<ResizeShadow> > WindowShadowMap;
     49 
     50   // Creates a shadow for a given window and returns it.  |window_shadows_|
     51   // owns the memory.
     52   ResizeShadow* CreateShadow(aura::Window* window);
     53 
     54   // Returns the resize shadow for |window| or NULL if no shadow exists.
     55   ResizeShadow* GetShadowForWindow(aura::Window* window);
     56 
     57   WindowShadowMap window_shadows_;
     58 
     59   DISALLOW_COPY_AND_ASSIGN(ResizeShadowController);
     60 };
     61 
     62 }  // namespace internal
     63 }  // namespace ash
     64 
     65 #endif  // ASH_WM_RESIZE_SHADOW_CONTROLLER_H_
     66